docs: clarify test commit message convention

CLAUDE.md

@@ -138,6 +138,8 @@ Use Angular commit message format: `type(scope): description`
   - `fix(sync): handle network timeout gracefully`
   - `refactor(projects): simplify project selector logic`
 
+**Note**: Use `test:` for test changes, not `fix(test):`.
+
 ## 🚫 Anti-Patterns → Do This Instead
 
 | Avoid                                | Do Instead                                                                          |

src/assets/icons/bottom-panel-open.svg

@@ -0,0 +1,6 @@
+<svg xmlns="http://www.w3.org/2000/svg"
+     height="24"
+     viewBox="0 0 24 24"
+     width="24">
+  <path d="M8 11.5h8l-4-4-4 4zM5 21c-0.825 0-1.413-0.587-1.413-1.413V5c0-0.825 0.588-1.412 1.413-1.412h14c0.825 0 1.412 0.587 1.412 1.412v14.587c0 0.826-0.587 1.413-1.412 1.413H5zm0-7h14V5H5v9z" />
+</svg>